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S12700 V200R010C00 Configuration Guide - WLAN-AC

This document describes native AC (hereinafter referred to as WLAN AC) configuration procedures and provides configuration examples.
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Configuring a Mesh Handover Profile

Configuring a Mesh Handover Profile

Context

A Mesh handover profile contains vehicle-ground fast link handover parameters. A Mesh profile can provide the fast link handover function only after a Mesh handover profile is bound to it.

Procedure

  1. Run:

    system-view

    The system view is displayed.

  2. Run:

    wlan

    The WLAN view is displayed.

  3. Run:

    mesh-handover-profile name profile-name

    A Mesh handover profile is created, and the Mesh handover profile view is displayed.

    By default, the system provides the Mesh handover profile default.

  4. Run:

    location-based-algorithm enable [ moving-direction { backward | forward | undetermined } ]

    The location-based enhanced fast link handover algorithm is enabled, and the moving direction of the vehicle-mounted AP is configured.

    By default, the location-based enhanced fast link handover algorithm is disabled and the moving direction of the vehicle-mounted AP is undetermined.

    NOTE:

    After the location-based enhanced link handover algorithm is enabled, the vehicle-mounted AP will switch the active link to the nearest trackside AP that meets handover requirements.

    In vehicle-ground communication scenarios, signals of a trackside AP distant from a train may be temporarily better than the trackside AP near the train due to radio environment changes. If an active link handover occurs at this time, the active link may be incorrectly switched to the distant trackside AP. To prevent incorrect handovers and improve vehicle-ground communication quality, you can use the location-based enhanced link handover algorithm. This algorithm requires that trackside APs be named in ascending or descending order of sequence numbers.

    Trackside APs should be named in head-name_sequence-number format. head-name describes track line information and can be different for trackside APs on the same track. It is recommended that you set the same head-name for APs on a track to differentiate tracks. sequence-number of APs along a track must be in descending or ascending order. The sequence numbers of trackside APs can be set with unequal steps. head-name and sequence-number are separated using an underline (_), for example, L1_001, L1_002, L1_005, L1_010.

  5. Run:

    max-rssi-threshold value

    The maximum RSSI threshold of a Mesh link is specified.

    By default, the maximum RSSI threshold of a Mesh link is -20 dBm in a Mesh handover profile.

  6. Run:

    min-rssi-threshold value

    The minimum RSSI threshold of a Mesh link is specified.

    By default, the minimum RSSI threshold of a Mesh link is -60 dBm in a Mesh handover profile.

  7. Run:

    link-hold-period value

    The holding time of a Mesh link is specified.

    By default, the holding time of a Mesh link is 4,000 ms.

  8. Run:

    rssi-margin value

    The RSSI threshold for a Mesh link handover is specified.

    By default, the RSSI threshold for a Mesh link handover is 10 dB.

  9. Run:

    link-probe-interval value

    The Mesh link probe interval is specified.

    By default, the Mesh link probe interval is 100 ms in a Mesh handover profile.

  10. Run:

    p-n criteria observe-time observe-value qualify-time qualify-value

    The P/N criterion for a handover is specified.

    By default, the observing value in the P/N criterion is three detection times and the qualified value is two detection times.

  11. Run:

    urgent-handover low-rate threshold rate-value period time

    The minimum rate threshold for an emergency handover and the minimum rate holding time are specified.

    By default, the minimum rate threshold for an emergency handover is 10 Mbit/s and the minimum rate holding time is 2,000 ms.

  12. Run:

    urgent-handover punishment period time rssi value

    The penalty parameters for an emergency handover are configured.

    By default, the penalty period for an emergency handover is 2,000 ms and the penalty level is 10 dB.

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Updated: 2019-04-20

Document ID: EDOC1000142094

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